tce-load -i compiletc perl5 bash ncursesw-dev bc glibc_apps elfutils

cd linux-4.19.10

$ grep -i dell .config
# CONFIG_DELL_RBU is not set

make mrproper
cp config-4.19.10-tinycore64 .config
make oldconfig
make prepare
make modules_prepare

cp Module.symvers-4.19.10-tinycore64.gz Module.symvers
make SUBDIRS=scripts/mod

make modules [52m 41.34s]

gzip drivers/firmware/dell_rbu.ko
advdef -z4 drivers/firmware/dell_rbu.ko.gz
sudo mkdir -p /usr/local/lib/modules/4.19.10-tinycore64/kernel/drivers/firmware
sudo cp drivers/firmware/dell_rbu.ko.gz /usr/local/lib/modules/4.19.10-tinycore64/kernel/drivers/firmware